.welcome {
    text-align: center;
    font-size: 20px;
    padding-top: 20px;
    display: block;
}

.search, .page {
    width: 980px;
    text-align: center;
    margin: 20px auto 0px;
}

.list {
    width: 980px;
    text-align: center;
    margin: 20px auto 0px;
    min-height: 300px;
}

.operation_btn {
    text-align: right;
    height: 20px;
}

.grade_window, .major_window, .teacher_window {
    width: 300px;
    height: 150px;
}

.error {
    font-size: 12px;
    color: red;
}

/*学生添加列表单独处理*/
.student_window {
    width: 300px;
    height: 220px;
}

.clazz_window {
    width: 300px;
    height: 200px;
}

.student_window table {
    width: 100%;
    height: 80%;
}

.teacher_clazz_window {
    width: 450px;
    height: 300px;
    margin-left: -225px !important;
}